Altitudinal range: from the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies) to the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)
Note: this taxon, which is known only from the type collection on Betula, could be related to Arthopyrenia grisea (see Nimis 1993: 565); it has an effuse, thin, episubstratic, continuous, olive-brown thallus, and minute, numerous, black, hemispherical and often confluent perithecia, 6- to 8-spored, ventricose asci, and fusiform, 3-septate, hyaline ascospores (28-30 × c. 7 μm).
